Jar-closure.



PATENTED NOV. 5, 1907.

D. KNOWLTON.

JAR CLOSURE.

APPLICATION FILED JULY 23.- 1907.

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UNITED STATES PATENT @FFTCE.

DALLAS KNOWLTON, OF WASHINGTON, DISTRICT OF COLUMBIA.

JAR-CLOSURE.

Application filed July 23 To all whom it may concern:

Be it known that I, DALLAS KNOWLTON, a citizen of the United States, residing at the city of Washington, in the District of Columbia, have invented certain new and useful Improvements in Jar-Closures, of which the following is a specification.

My invention relates to closures of the clamping type for glass jars, though it is applicable to other vessels of simple construction.

The object of this invention is to provide a simple and inexpensive rotatable clamping means that will permit of establishing not only the application of a varying or graduated power by a central pressure on the closure plate or cap through the action of spring-lever age working in conjunction with an inclined plane, but one that will maintain a positive mechanical connection between the jar and closure plate while being sub ject to the varying power application.

Referring to the accompanying drawings, Figure 1, shows a side elevation of a jar with the closure cap in place and the clamping means applied,.while Fig. 2, shows the clamp removed and in enlarged detail.

Referring to the drawings by numeral, 7, designates the upper portion of a jar that is preferably made of glass pressed into shape, and which is shown as having formed on its neck 8, a short distance below the mouth 9, an annular rim or flange 10, the upper horizontal face of which serves to form a peripheral seat 11, that extends in a horizontal plane to provide a seat for a rubber gasket or washer 12, which is preferably angular in cross-section.

At equal intervals or points apart from each other upon the outer circumference of the neck of the jar, there is provided a corresponding series of locking lugs or bosses 13, which are formed integral with the jar, while the under edges or working-faces thereof extend to provide an inclined way or bead 14, which in turn are adapted to be engaged by the fastening or clamping means to be presently described.

15 designates a closure plate or cap, that is preferably made of glass, and which is provided with an integral depending annular flange 16, of a diameter to fit snugly about the upper edge of the neck of the jar, and that is adapted to be seated to compress the packing or rubber gasket 12, upon and against the shoulder or seat 11, of the flange 10. The closure plate may be formed with a flat top or one raised centrally as shown, to add to the Specification of Letters Patent.

Patented Nov. 5, 1907.

1907. Serial No. 385,181.

strength thereof, and which is shown as being centrally depressed to provide a cup 17, for the reception of the central bearing portion of the clamping means to. be presently referred to. The clamping member comprises a strip or sheet of metal that is bent at its outer end portions downwardly into vertical relation with respect to the central horizontally extending portion, in such a manner that when in applied position, the arms 18, and 19 will be produced and will pass over the edge of the closure plate or cover upon directly opposite sides thereof, while the free ends of said arms are bent inwardly at right angles to provide short engaging fingers or jaws 20. In order that the clamping means thus proposed be effective and reliable it is requisite that the clamping bar should be strong enough to support a given pressure for a given span of said bar, and moreover, it should be stiff enough to prevent a deflection at the center, that would in any degree allow a yielding of the parts at that point, and to this end there is provided a conical depending teat 21, that is produced preferably by upsetting the metal in a manner to crowd the molecules 'of metal into the shape shown. Thus it will be seen that a pendent strut is produced that is built on the lines of a truss triangular in crosssection, and by reason of the manner of crowding the metal into a conoidal shaped structure, having a greater cross-section than the remainder of the clamp, there is provided the strongest known structural element and one which has the capacity to effectually resist all tendency to yield or buckle at the central bearing point of the bar under any degree of stress which in practice it maybe subjected to.

desire to presence DALLAS KNOWL'TON.

Witnesses .Iosnrn W. BUELL, .T. II. Bononss. 

